If you experience excessive engine noise on startup (after the engine has been turned off for several hours) that lasts for more than five or six seconds, turn off the engine and check that the engine oil level is correct. If the oil level is correct, the noise may be caused by the timing chain tensioner. Hyundai has an improved tensioner to correct this problem.Google+
Car Problem Reports
Hyundai Azera Improved Timing Chain Tensioners Available to Correct Noise on Startup
Hyundai Azera Problem
Average Mileage: 60,994 mi (20,532 mi - 102,000 mi)
Visitor, 2007 Hyundai Azera, 77,401 mi
I started car this morning loud knocking sound, after few minutes noise goes away, waiting to let car sit a few hours and start it again to see if I get same issue, making appointment with dealer ASAP
i had the chain tensioner rep;aced at 77000 miles it makes more noise that the old one.The chin guides broke the dealer replaced guides and tensioner i now have 123000 miles on it when i start it it makes noise for 5min or more when i drive it.i have to let it idle or a while so i dont hear the noise/
Visitor, 2007 Hyundai Azera, 20,532 mi
Tapping sound on startup. Noise gradually goes away in 30 to 45 seconds of driving. Timing chain tensioner was replaced at 34212 miles. Repairs seemed to fix problem. Then after 500 miles tapping sound has come back. Problem not fixed, in fact as I type this my Azera is sitting in dealership garage. Dealership now says they will not fix it clamming the sound is normal. Can you believe that?
Visitor, 2013 Hyundai Azera, 25,000 mi
knocking noise upon start up. Goes away quickly. Sounds like an old diesel.
Visitor, 2007 Hyundai Azera, 102,000 mi
Noisy lifters for about 30 seconds after start up, when engine is cold.
Visitor, 2008 Hyundai Azera
Same ticking noise until engine warms up for a couple minutes. Worse when it's cold out.
Visitor, 2009 Hyundai Azera, 70,000 mi
Knocking slapping sound at startup for about 3 seconds. Very noticable but after 3 seconds noise is gone till car is shut off and sits for about a few hours. Oil is new and filter.
Visitor, 2009 Hyundai Azera, 49,000 mi
Visitor, 2006 Hyundai Azera, 85,000 mi
Car is new to us, and is in Perfect condition except for that.
Visitor, 2006 Hyundai Azera, 35,000 mi
Dealer fixed it under warranty. No charge, except for the oil refill, even though the oil interval had not reached the time to change it.